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Code of Practice for Water Treatment
Service Providers (Cooling Tower Systems)
January 2002
Department of Human ServicesPublic Health Group
ii
FeedbackThe Department welcomes feedback on this
document. Comments can be made in writing
to the Legionella Risk Management Project within
the Public Health Group, or via e-mail to
lrmp@dhs.vic.gov.au
Published by Public Health Group
Victorian Government Department of Human
Services
Melbourne, Victoria
January 2002
Also published on www.legionella.vic.gov.au
© State of Victoria 2002
(0951201)
DisclaimerThis document is intended only as a general guide.
No warranty as to the completeness of the
information is given. The Department of Human
Services and its employees disclaim all liability and
responsibility for any direct or indirect loss or
damage which may be suffered through reliance on
any information contained in or omitted from this
document, and no person should act solely on the
basis of the information contained in the document
without taking appropriate professional advice
about obligations in specific circumstances.
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Contents
Preface v
Executive Summary vii
1 Introduction 11.1 A Living Document 1
1.2 Objectives 1
2 Legal Obligations 22.1 Legislation 2
2.2 Australian Standards 2
2.3 Published Guidelines 3
3 Roles and Responsibilities 43.1 Land/Building/Facility Owners 5
3.2 Asset Management Companies 5
3.3 Mechanical Service Contractors 5
3.4 Water Treatment Service Providers 6
3.5 Reporting System Deficiencies 7
3.6 Communication between Responsible Persons 7
4 Contingency Planning and Management 84.1 Developing Contingency Plans 8
5 Sampling and Testing of Cooling Tower Waters 95.1 Sampling Cooling Tower Waters 9
5.1.1 Sampling Point 9
5.1.2 Independent Sampling 9
5.1.3 NATA Accredited Sampling 10
5.2 Testing Cooling Tower Waters 11
5.2.1 Microbiological Testing 11
5.2.2 Testing Chemical and Physical Parameters 11
6 Water Treatment 126.1 Water Quality 12
6.2 Microbial Control 12
6.2.1 Biocides 12
6.3 Scale Control 13
6.4 Corrosion Control 13
6.5 Non-Chemical Options 13
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6.6 Specific System Controls 14
6.6.1 Auto-Dosing Equipment 14
6.6.2 Make-Up Water and Bleed Rate Controls 14
6.6.3 System Cleanliness 15
6.7 Record-Keeping 15
7 Management Systems 167.1 Quality Control and Quality Assurance 16
7.2 Occupational Health and Safety 17
7.3 Environmental Management 17
7.4 Risk Management 17
8 Occupational Health and Safety 188.1 Potential Exposure to Legionella Bacteria 18
8.2 Chemical Issues 19
8.2.1 Personnel Protective Equipment 19
8.2.2 Dangerous Goods and Hazardous Substances Requirements 19
8.2.3 Compatibility 19
8.3 Industrial Sites 20
8.4 Electromagnetic Radiation 20
8.5 Access/Egress and Working at Heights 20
8.6 Confined Spaces 21
8.7 Climatic Considerations 21
8.8 Electrical Safety 22
8.9 Manual Handling 22
9 Environmental Management 239.1 Waste Management 23
9.1.1 Spills and Leaks 23
9.2 Authorised Discharge to Sewer 24
9.2.1 Notification Requirements 24
10 Training 25
11 Accreditation 26
12 Insurance Requirements 27
13 Contracts 28
Glossary 29
Contents
v
Preface
The development of this Code of Practice has been facilitated by the
Government of Victoria’s Department of Human Services as part of its
Legionella Risk Management Strategy.
The Code of Practice was developed by the
Department in partnership with a consultative
committee established for this purpose. The
committee consisted of members of the Water
Treatment Service Provider (WTSP) industry, the
Plastics and Chemicals Industries Association
(PACIA) National Water Treatment Group, WorkSafe
Victoria, EPA Victoria, Melbourne University
Microbiology, Plumbing Industry Commission, Air
Conditioning Mechanical Contractors Association,
Australian Institute of Refrigeration Air-Conditioning
and Heating (AIRAH), Property Council of Australia,
Construction, Forestry, Mining and Energy Union
(CFMEU), and the Department of Human Services.
Further consultation with stakeholders occurred
through a one-day workshop held in late May 2001
and subsequent mail-outs of new resources as they
were produced. Over twenty submissions were
received from industry members, representative
associations, regulators, water authorities, and other
interested parties.
Establishing a Special Interest Group (SIG) for
WTSPs under the auspices of AIRAH during the
consultative phase has provided for the first time a
mechanism for the representation of the WTSP
industry in Victoria that incorporates the views of
large, medium and small companies. It is hoped that
this may become a national model for the industry.
AIRAH has, during the course of development of
the Code, proactively engaged with industry
members and consulted frequently with the
Department and their project consultant, Egis
Consulting Australia P/L.
The provisions of the Code, and the supporting
information and guidance to be provided in an
accompanying Guidance Manual (currently under
development) are now largely representative of
what the industry and the Department believe
should be covered in the Code. Notwithstanding
some points of contention and disagreement from
some sectors, consensus has been reached as far as is
possible at present on such a complex and
significant issue. It is hoped that in subsequent
revisions of the Code over time, these issues can be
suitably resolved.
It is the Government’s and the industry’s wish that
the Code of Practice will serve as an accepted ‘best
practice’ standard for the industry and lead to more
professional, consistent and accountable service which
will ultimately reduce the potential occupational
and public health risks associated with the presence
of Legionella bacteria in cooling tower systems.
The Department of Human Services and AIRAH
will promote the application of the Code of
Practice for WTSPs (Cooling Tower Systems)
throughout industry as a recognised standard for
adoption by WTSPs. Compliance with the Code is
voluntary. However, the process of organisational
accreditation will establish compliance
requirements on organisations that wish to
become accredited.
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Preface
Industry accreditation arrangements to be
established by AIRAH will signify that an
organisation complies with the Code, is prepared to
be independently audited for compliance, and will
comply with the rules of accreditation. It also
demonstrates that it meets the required training and
competency standards developed by the industry
for the provision of such technical services.
This is an important non-regulatory lever for
improving the general performance of the industry
and providing some assurance to cooling tower
system owners that their systems are being
maintained appropriately by competent
organisations.
The Code will encourage continuous improvement
within the industry at all times. It will be amended
from time to time to incorporate developments
within the industry and its developing
organisational structure and training requirements.
AIRAH will be responsible for reviewing and
amending the Code, in consultation with the
Department, PACIA and other stakeholders.
It is expected that the Code will be reviewed within
18 months of its release and endorsement by
Government.
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Executive Summary
This Code of Practice is considered an essential element of the
Government’s Legionella Risk Management Strategy.
The major objectives of the Code of Practice are:
• To minimise the potential risks to occupational
and public health from exposure to Legionella
bacteria arising from cooling tower systems.
• To provide guidance to WTSPs and their clients
on expectations for maintaining the waters of
cooling tower systems in accordance with a
system’s Risk Management Plan (RMP), and
relevant legislation and standards.
• To establish an accepted ‘best practice’ standard
for WTSPs to assist in achieving the above
objectives.
• To provide an acceptable self-regulating
mechanism for improving the industry’s collective
performance and accountability.
All WTSPs should comply with the relevant
legislative requirements, guidelines and Australian
Standards, and endeavour through the management
systems they have in place to proactively monitor
and validate their compliance with those
requirements.
Industry accreditation arrangements to be
established by AIRAH will signify that an
organisation which complies with the Code is
prepared to be independently audited for
compliance and will comply with the rules of
accreditation. It also demonstrates that it meets the
required training and competency standards
developed by the industry as being appropriate for
the profession.
Compliance with the Code is voluntary. However
the process of organisational accreditation will
establish compliance requirements on those
organisations that wish to become accredited. This is
an important non-regulatory lever for improving the
general performance of the industry and providing
some assurance to cooling tower system owners that
their systems are being maintained appropriately by
competent organisations.
The Code of Practice requires that WTSPs will:
• Comply with the relevant legal obligations for
cooling tower maintenance in Victoria.
• Inform the land, building or facility
owner/manager of all service treatments, testing
results and any defects observed in the system
and develop an agreed communication protocol
for each client.
• Where required to seek funds from the facility
owner (or their delegated representative) in order
to rectify reported system deficiencies, do so as
soon as is reasonably practicable and
communicate the potential consequences of
inaction.
• Maintain a cooling tower system’s water quality
such that the performance, efficiency and
expected lifetime of operation of the system is
maintained within acceptable limits.
• Only employ competent, appropriately experience
and qualified personnel to manage and/or
maintain cooling tower systems on behalf of their
clients.
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• Ensure that samples are taken from designated
and identified sampling points in cooling tower
systems at appropriate intervals, and delivered to
laboratories accredited by NATA, for testing to be
conducted within the required timelines;
• Notify the Department of Human Services where
three consecutive positive Legionella test results
are received.
• Notify the Department of Human Services where
continued inaction to rectify a deficient cooling
tower system by the system owner or their
delegated representative results in a potentially
significant risk to occupational and/or public
health.
• Have contingency plans in place for each cooling
tower system serviced, to ensure compliance with
legislation on the notification of adverse events
and subsequent remedial actions.
• Test and record chemical and physical parameters
as required, to ensure that the treatment regime
adopted for a cooling tower system is being
maintained within acceptable limits.
• Use appropriate chemicals at effective
concentrations, as per manufacturer’s
specifications, for the maintenance of the desired
water quality within a cooling tower system.
• Ensure that where non-chemical options are
utilised for microbial control within a cooling
tower system, they are effective and fit for
purpose, and that chemical treatment is available
if an adverse event occurs.
• Use auto-dosing equipment (or equivalent) for the
maintenance of microbial control and auto-bleed
equipment (or equivalent) for the maintenance of
water quality.
• Provide and maintain records of maintenance and
servicing for the client’s records.
• Develop and deploy management systems to
address issues of quality control and quality
assurance; occupational health and safety;
environmental management; and risk
management.
• Abide by all relevant occupational health and
safety requirements on site, and work in a safe
manner as directed by the WTSP’s and/or client’s
health and safety management plan.
• Ensure that all chemical containers left on-site are
appropriately labelled and that Material Safety
Data Sheets (MSDS) for each chemical or
formulation are left with the client on-site, or are
clearly located in close proximity to the chemicals
used in treating the cooling tower system.
• Ensure that all wastes generated from the water
treatment of cooling tower systems are managed
and disposed of in accordance with the
requirements of EPA Victoria, and the local
sewage authority.
• Have public liability and professional indemnity
insurance (or equivalent) appropriate for the
nature and number of cooling tower systems
serviced.
• Have contracts with clients that clearly indicate
the respective responsibilities of each party.
To allow time for WTSPs to prepare for the
compliance requirements of the Code of Practice
and for the industry accreditation arrangements to
be established, the implementation timeline for this
version of the Code of Practice is 1 July 2002.
Executive Summary
1
1 Introduction
The Code of Practice is considered an essential element of the
Government’s Legionella Risk Management Strategy.
Adherence to and compliance with the Code of
Practice will be recommended by of the Department
of Human Services in its written advice to and
guidelines for water treatment service providers
(WTSP) and other relevant stakeholders.
The Department of Human Services and AIRAH
will promote the application of the Code of Practice
for WTSPs (Cooling Tower Systems) throughout
industry, as a recognised standard for adoption by
WTSPs. Compliance with the Code is voluntary.
However, the process of organisational accreditation
will establish compliance requirements on those
organisations that wish to become accredited. As it
will take some time and effort for companies to
comply with the Code, a six month period of grace
will be given in order for companies who have
signified their intent to comply to reach the required
standards.
This Code of Practice will provide the ‘best practice’
benchmark for water service treatment providers to
achieve.
1.1 A Living DocumentThe Code of Practice is a living document, designed
to reflect currently accepted best practice as a
minimum operating standard.
As treatment technologies and chemical
formulations will change and improve, the
document must be careful not to restrict or preclude
new or emerging technologies, or chemical
products. A performance-based approach is
therefore desirable, with the practitioner choosing
the technology and/or chemical system that best
suits the client’s particular needs, while achieving
regulatory expectations.
As these improvements and changes take place, the
Code of Practice will be amended to reflect them. It
will evolve along with the collective expectations of
the industry, the Government and other
stakeholders such as building owners, asset
management companies, mechanical service
contractors and the general public.
It is expected that the Code will be reviewed within
18 months of its adoption by the Department and
AIRAH, through a consultative committee
consisting of representatives of all relevant
stakeholders.
1.2 ObjectivesThe major objectives of the Code of Practice are as
follows:
• To minimise the potential risk to occupational and
public health from exposure to Legionella bacteria
arising from cooling tower systems.
• To provide guidance to WTSPs on maintaining the
waters of cooling tower systems, in accordance
with the Risk Management Plan (RMP) and
relevant legislation and standards.
• To establish an accepted ‘best practice’ standard
for WTSPs, to assist in achieving the above
objectives.
• To provide an acceptable self-regulating
mechanism for improving the industry’s collective
performance and accountability.
2
1 Further discussion of many of these requirements can be found in theGuidance Manual.
All WTSPs must comply with the requirements relevant to them from
the following legislation, guidelines and Australian Standards, and
endeavour through their management systems to proactively monitor
and validate their compliance with these requirements.1
2.1 LegislationIn Victoria, the following legal obligations can apply
to cooling tower systems and the people or
organisations responsible for them:
• Building (Legionella) Act 2000
– Building (Legionella Risk Management)
Regulations 2001
• Plumbing (Cooling Towers) Regulations 2001
• Health Act 1958
– Health (Legionella) Regulations 2001
• Occupational Health and Safety Act 1985
– Occupational Health and Safety (Hazardous
Substances) Regulations 1999
– Occupational Health and Safety (Manual
Handling) Regulations 1999
– Occupational Health and Safety (Confined
Spaces) Regulations 1996
– Occupational Health and Safety (Plant)
Regulations 1995
• Environment Protection Act 1970
– Environment Protection (Prescribed Waste)
Regulations 1998
• Dangerous Goods Act 1985
– Dangerous Goods (Storage and Handling)
Regulations 2000
• Drugs Poisons and Controlled Substances Act 1981
• Water Act 1989
• Water Industry Act 1994
– Water Industry Regulations 1995
Note that under the Drugs, Poisons and Controlled
Substances Act, a Poisons Licence must be obtained
by companies or individuals who manufacture and
sell, or supply by wholesale, Schedule 5 or 6 poisons
(such as water treatment biocides). In this context,
manufacture can include re-labelling, decanting into
smaller containers, and dilution of product.
In addition, the following Australian Standards and
guidelines apply to the management, maintenance
and servicing of cooling tower systems.
2.2 Australian Standards • AS/NZS 3666: Air-handling and water systems of
buildings—Microbial control:
– AS/NZS 3666.1, Part 1: Design, installation and
commissioning
– AS/NZS 3666.2, Part 2: Operation and
maintenance
– AS/NZS 3666.3, Part 3: Performance-based
maintenance of cooling water systems.
• AS/NZS 4276.3.1: Water microbiology—
Heterotrophic colony count methods—Pour plate
method using plate count agar.
• AS/NZS 3896: Waters—Examination for
Legionellae, including Legionella pneumophila.
• AS/NZS 2031.2, Part 2: Microbiological—Selection
of containers and preservation of water samples
for chemical and microbiological analysis.
2 Legal Obligations
3
• AS 2865: Safe working in a confined space.
(Worksafe Australia National Standard)
• AS/NZS 1715: Selection, use and maintenance of
respiratory protective devices.
• AS/NZS 1716: Respiratory protective devices.
• AS/NZS 1336: Recommended practices for
occupational eye protection.
• AS/NZS 1337: Eye protectors for industrial
applications.
• AS/NZS 1269.3: Occupational noise
management—Hearing protector program.
• AS 2380: Electrical equipment for explosive
atmospheres.
• AS 2430: Classification of hazardous areas.
• AS 3190: Approval and test specifications—
Residual current devices (current operated earth
leakage detectors)
• AS/NZS 3500, Part 1 and Part 2: National
Plumbing and Drainage Code.
• AS/NZS 4801: Occupational Health and Safety
Management Systems—Specifications and
guidance for use.
• AS/NZS ISO 9001: Quality management
systems—Requirements.
• AS/NZS ISO 14000: Environmental Management
Systems.
• AS/NZS 4360: Risk Management.
2.3 Published Guidelines• A Guide to Developing Risk Management Plans for
Cooling Tower Systems, Department of Human
Services, Public Health Division, 2001.
• Supplementary Notes for Hospitals, Department of
Human Services, Public Health Division, 2001.
Note
The legislation and documentation referred to above is to
be the current document applicable, as amended, at the
time of use or referral.
Where discrepancies exist between the documents listed
above, the Victorian legislation will take precedence over
relevant standards and guidelines.
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In examining the roles and responsibilities of WTSPs, it is important to
also identify and clarify the relationships with other parties that play a
role in the management of cooling tower systems. It is common for
WTSPs to be contracted by mechanical services contractors to
undertake certain maintenance and servicing tasks with respect to
cooling tower systems. Mechanical services contractors are also
usually contracted by either land/building/facility owners or contracted
asset management companies to maintain mechanical plant and
equipment, including cooling towers.
The Building (Legionella) Act 2000 sets out
responsibilities for landowners in relation to the
registration of cooling tower systems and the
development of Risk Management Plans (RMPs).
The Health (Legionella) Regulations 2001 state that
“the responsible person must ensure that the water of
the cooling tower system is maintained in a clean
condition”, and that “the responsible person must
ensure that the water of the cooling tower system is
continuously treated with one or more biocides to
effectively control the growth of micro-organisms,
including Legionella; and chemicals or other agents to
minimise scale formation, corrosion and fouling”.
Regulation 5 of the Health (Legionella) Regulations
2001 defines a “responsible person” to mean “the
person who owns, manages or controls the cooling
tower system or warm water system”. The
“responsible person” may be the owner of the
system or the person or company who manages it
on their behalf.
In addition to responsibilities imposed by
legislation, which is outlined above, the law of
negligence imposes certain duties on the owner,
asset manager, mechanical services contractor and
WTSP in respect of the cooling towers. The content
of this duty depends on the circumstances, the
contractual responsibilities and relationships. There
are also legal requirements on service-providers to
provide services that are fit for their purpose and of
merchantable quality.
To ensure that their responsibilities are met, the
owner or asset manager should ensure that it
chooses a competent WTSP to maintain its cooling
towers.
3 Roles and Responsibilities
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It is critically important that any deficiencies noted
with respect to a cooling tower system are
communicated to a “responsible person” for
appropriate action. Inter-relationships between the
following will need to be examined:
• Cooling tower system design, construction and
commissioning.
• Maintenance of mechanical and electrical systems
associated with the cooling tower system.
• Treatment of the system’s water to control
potential pathogens, corrosion and scale.
• The likelihood of unacceptable levels of Legionella
and/or high heterotrophic colony counts (HCC).
For the purposes of the Code, the following roles
and responsibilities are described and based on the
likely responsibilities and contractual arrangements
of the various parties generally involved with a
cooling tower system.
3.1 Land/Building/FacilityOwners
It is the responsibility of the land, building or
facility owner to:
• Ensure that RMPs are prepared, implemented,
maintained and audited for all cooling tower
systems under their control in accordance with the
Building Act requirements.
• Take appropriate action to rectify any deficiencies
communicated to them by those persons
contracted to maintain the cooling tower system
in good order, and in accordance with the RMP,
on their behalf.
• Take all reasonable steps to ensure that they
engage competent and appropriately experienced
and qualified personnel to manage and/or
maintain a cooling tower system on their behalf.
3.2 Asset ManagementCompanies
Where an asset management company is contracted
to maintain a cooling tower system on behalf of the
facility’s owner, then the asset management
company undertakes the responsibilities, as outlined
above, for building/facility owners. However, this
contractual arrangement does not absolve the
building/facility owner from their responsibilities.
Where the asset management company is required
to seek funds from the facility owner in order to
rectify reported system deficiencies, it is their
responsibility to do so as soon as is reasonably
practicable and to communicate the possible
consequences of inaction to the facility’s owner.
3.3 Mechanical ServiceContractors
Where a mechanical service contractor is contracted
to maintain a cooling tower system on behalf of the
facility’s owner, this contractual arrangement does
not absolve the building/facility owner from their
responsibilities.
It is a responsibility of mechanical service
contractors to report cooling tower system
deficiencies to the appropriate “responsible person”
for action as soon as is reasonably practicable, and
to communicate the potential consequences of
inaction to the “responsible person”.
Where the mechanical service contractor is required
to seek funds from the facility owner (or their
delegated responsible representative) in order to
rectify reported system deficiencies, it is their
responsibility to do so as soon as is reasonably
practicable and to communicate the potential
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3 Roles and Responsibilities
consequences of inaction to the facility’s owner (or
their representative).
The “responsible person” may be the facility owner
or an asset management company. Some factors
relevant to determining the identity of the
“responsible person” are any contractual
arrangements, the type of deficiency noted to exist
(such as ‘dead legs’ in pipework, water circulation
pump failure, drift eliminator replacement, UV lamp
failure, or exhausted treatment chemical supply)
and also whether additional funds are required to
rectify the reported system deficiency.
3.4 Water Treatment ServiceProviders
The responsibilities of WTSPs will be determined by
the contracts entered into by them in relation to the
cooling towers. Additional responsibilities will also
be determined by the duty of care owed by WTSPs
and the requirement to deliver services that are fit
for their purpose and of merchantable quality.
The likely range of contractual responsibilities for
WTSPs is as follows:
• Maintain the water in a cooling tower system in
accordance with the requirements of the Risk
Management Plan (RMP), and the relevant
regulations and standards, on behalf of the client.
• Maintain water quality such that the cooling
tower system’s performance or efficiency, and the
expected lifetime of operation of the system, stays
within acceptable limits.
• Report cooling tower system deficiencies beyond
their control to the appropriate “responsible
person” for action as soon as is reasonably
practicable, and to communicate the possible
ramifications of inaction to the “responsible
person” (in some cases this may be via contractual
arrangements and agreed communication
protocols).
• Take all reasonable steps to ensure that they
deploy competent and appropriately experienced
and qualified personnel to manage and/or
maintain cooling tower systems on behalf of their
clients.
Compliance with the Code of Practice for WTSPs
(Cooling Tower Systems) is voluntary for WTSPs
and is not required by legislation. The Department
of Human Services and AIRAH will promote the
application of the Code of Practice for WTSPs
(Cooling Tower Systems) throughout industry as a
recognised standard for adoption by WTSPs.
Industry accreditation arrangements to be
established by AIRAH will signify that an
organisation complies with the Code, is prepared to
be independently audited for compliance and will
comply with the rules of accreditation. It also
demonstrates that it meets the required training and
competency standards developed by the industry as
being appropriate for the provision of such technical
services.
Therefore it is strongly recommended that WTSPs
put appropriate management systems into place
that can maintain and verify compliance with the
Code of Practice.
Note: Persons who provide only cooling tower cleaning
services, which may be subcontracted by WTSPs, are not
considered to be WTSPs for the purposes of this Code,
unless they treat the cooling tower water with chemical
biocides, as is required when a system goes through the
“clean, disinfect, clean” cycle required by regulation.
Tower cleaning should be undertaken under the
supervision of the responsible WTSP.
7
3.5 Reporting SystemDeficiencies
The reporting of system deficiencies and
appropriate timely action to rectify such deficiencies
is a major issue with respect to the control of
Legionella bacteria in cooling tower systems.
Any reported deficiencies should be included as a
required improvement, or condition, within the
RMP. Until the deficiency is rectified it may be
necessary to upgrade the water treatment program.
It is recommended that WTSPs inform the
Department of Human Services of the potential
risk posed by a cooling tower system where:
• Continued inaction to rectify reported system
deficiencies occurs.
• The water treatment regime is incapable of
controlling water quality within accepted or
regulated limits due to these deficiencies.
• The system is considered by the WTSP to be of
significant potential occupational and/or public
health risk.
Any reports on cooling towers of concern should be
directed to the Manager, Environmental Health
Unit, Department of Human Services. They will
assess the risk situation and may send an inspector
to assess the problem facility and take samples to
determine if there have been any breaches of the
Building Act or the Health (Legionella) Regulations
2001. The Department may take further action as
appropriate.
3.6 Communication betweenResponsible Persons
Notwithstanding the roles and responsibilities
described above, communication responsibilities
should be clearly defined in the contract of
engagement between WTSPs and their clients and
be in accordance with the provisions of this Code
and the Guide to Developing Risk Management
Plans for Cooling Tower Systems, published by the
Department of Human Services.
The communication protocols for relaying the
results of an adverse event and the subsequent
remedial actions taken should also be defined in the
contract of engagement between the WTSP and the
client. Agreed communication protocols should also
be described in the RMP.
8
4 Contingency Planningand Management
Contingency planning and management are essential in ensuring an
appropriate and timely response to an adverse event, complying with
regulatory requirements, and meeting the expectations of clients.
Contingency planning is therefore an integral part of an organisation’s
risk management strategy.
4.1 Developing ContingencyPlans
WTSPs should develop contingency plans to enable
them to comply with the provisions of the Health
(Legionella) Regulations 2001 when positive
Legionella or high HCC results occur. This is
particularly important for rural areas, where the
logistics of staff availability and transport times may
make compliance more difficult.
Samples must be delivered to a laboratory so that
tests can commence within 24 hours of the sample
being taken. Suitable arrangements must be made
to ensure that this takes place.
To achieve this, samples should arrive at the
laboratory within at least 20 hours of collection so
that analysis can commence within 24 hours.
Country areas can have samples collected late in the
day, couriered overnight and still comply.
Contingency planning and management should also
address the situation where an incident of
legionellosis may be associated with a cooling tower
discharge (refer to Guidance Manual for further
advice on this matter).
Contingency planning should address:
• Staff availability for adverse events.
• Transport logistics (covering servicing
requirements and sample delivery).
• Access to cooling tower systems (out of normal
working hours).
• Organising independent sampling (where
required under special circumstances).
• Ensuring sufficient “supplies” are available to
meet client needs.
There may be circumstances such as natural
disasters or other “acts of God” (bushfires, dust
storms and so on) which will impact on cooling
tower system performance. Timely compliance may
be beyond the scope of the industry affected. Such
exceptional circumstances should not be construed
as a servicing deficiency, and may be beyond the
expectations of normal contingency planning.
Contingency plans should be endorsed or ratified by
the client and a cost recovery mechanism included
in the contract to ensure that contingency plans can
be readily implemented.
9
5 Sampling and Testing of Cooling Tower Waters
To achieve the greatest possible consistency in the required
monitoring process, it is essential that sampling and microbial testing
be undertaken in accordance with the required standards.
5.1 Sampling Cooling TowerWaters
Samples shall be taken in containers as described in
AS 2031.2 (Selection of containers and preservation of
water samples for chemical and microbiological analysis:
Part 2—Microbiological) and collected as described in
AS/NZS3666.3 (Air-handling and water systems of
buildings—Microbial Control: Part 3—Performance-
based maintenance of cooling water systems) and stored
and transported as described in AS/NZS 3896
(Waters—examination for Legionellae, including
Legionella pneumophila) for Legionella samples, or as
described in AS 2031.2 for HCC samples.
These standards require that the samples be
transported to the testing laboratory and for
analysis to commence within 24 hours of the sample
being taken. This may be difficult to achieve when
servicing some rural areas and appropriate
contingency plans should be put into place to meet
the required timeframe. Note that 24 hours is the
upper limit and shorter processing times are
desirable.
5.1.1 Sampling PointTo minimise variables associated with the sampling
and microbial testing of cooling tower waters each
cooling tower system should have a clearly identified
sampling point from where all regular sampling
occurs. This may be indicated by a sign or label
directing where all routine sampling is to take place.
Sampling should never occur next to, or
immediately downstream of, where make-up
water or biocide is introduced into the system.
It is recommended that sampling occurs at a readily
accessible point in the return line, and a tap be fitted
for this purpose. When sampling from the return
line, water should be allowed to run for a minimum
of 30 seconds and/or flushed with a sufficient
volume of water prior to the sample being taken. If
this is not possible, the sample should be collected
from the designated sampling point.
The designated sampling point should be
documented in the system’s Risk Management Plan.
5.1.2 Independent SamplingSampling should normally be undertaken by the
WTSP as part of the range of professional services
offered to the client.
There may be special circumstances whereby
regular or random independent sampling is highly
desirable, in order to avoid potential allegations of a
conflict of interest, and/or to reassure the client,
workers and/or the public about a system’s
performance.
10
Special circumstances cover:
• Where cooling towers in a given area are to be
tested on the request of the Department of Human
Services, due to an incident(s) of legionellosis.
• Where a tower is deemed to be of high risk as
determined by the facility’s Risk Management
Plan, such as cooling towers associated with
healthcare facilities, or sited in areas of high
population density, such as major urban
commercial centres and large shopping
complexes.
The client and/or the “responsible person” always
have the prerogative to conduct independent testing
if they wish to independently verify system
performance. The opportunity for such independent
testing further reinforces the need for each system to
have a clearly designated sampling point, so as to
reduce the variability inherent in sampling from
different locations within the system.
Where independent sampling does take place, it is
important that the same NATA registered laboratory
be used for microbial testing as is normally used by
the WTSP in order to address the potential inherent
variability that exists in microbial testing between
laboratories.
There may be other reasons for independent
sampling in some areas due to the fact that
sampling of cooling tower waters should take place
at least 72 hours after system operation, following
disinfection, decontamination or cleaning
procedures, so as to allow the system to stabilise. In
rural areas, it is advisable to have a suitably trained
independent contractor available to take samples
and ship them to the nominated laboratory, to avoid
a lengthy return trip just for the purpose of
sampling.
The WTSP may contract out sampling to an
independent third party such as a NATA accredited
laboratory which undertakes microbial testing for
cooling tower systems, or another WTSP or
organisation with no ties to the contracting
organisation. This will be considered to constitute
independent sampling.
Where samples are taken for the purposes of
investigating the source of an incident(s) of
legionellosis, samples shall be split at the laboratory
in case a positive result is obtained. The split sample
can then be used to further investigate water quality
parameters if required.
5.1.3 NATA Accredited Sampling2
Sampling is considered to be a normal part of the
professional services undertaken by WTSPs.
However, where independent sampling is required,
it is appropriate that such sampling be undertaken
by individuals or organisations who have NATA
accreditation for undertaking this activity in
compliance with the appropriate standards.
It is recommended that laboratories that have NATA
accreditation for microbiological testing for
heterophilic bacteria and Legionellae develop a
capability in this area, so that the process of NATA
accredited sampling and NATA accredited testing
can occur under the management of the one
organisation wherever possible.
5 Sampling and Testing of Cooling Tower Waters
2 Note that at this time there is no NATA accredited sampling system inplace for cooling towers. This is an initiative proposed by the Code. It ishoped that such an accreditation can be established within twelve monthsof the introduction of this Code of Practice.
11
5.2 Testing Cooling TowerWaters
Testing for prescribed microbiological, chemical and
physical parameters is essential in order to monitor
the performance of a cooling tower system.
Such testing provides indicative feedback on system
performance with respect to:
• Control of Legionella bacteria and other
microorganisms.
• Effective maintenance of desirable water quality
standards, to achieve system efficiencies and
longevity in line with the system manufacturer’s
expectations.
5.2.1 Microbiological TestingThe Heterotrophic Colony Count (HCC) is a basic
test of the microbiological load in a cooling tower
system. Analysis must occur in accordance with AS
4276.3 (Water microbiology—Heterotrophic colony count
methods—Pour plate method using plate count agar).
Legislation also permits other methods such as
spread plate and membrane filtration.
Testing for Legionella must occur in accordance with
the provisions of AS 3896 (Waters—examination for
Legionellae, including Legionella pneumophilia).
The laboratory undertaking testing in accordance
with the above standards must be suitably
accredited by NATA.
Microbial testing should be conducted after
commissioning of a new cooling tower system and
the introduction of the water treatment program,
when system start-up occurs, or when there is a
change to the water treatment program, to validate
its acceptable performance.
5.2.2 Testing of Chemical and PhysicalParameters
Although the major focus with respect to testing of
cooling tower waters is microbial performance, it is
also important at times to check chemical and
physical parameters to ensure that they are within
appropriate limits for the cooling tower system in
question, the quality of the make-up water
available, and the type of treatment regime adopted
for the system.
Corrosion testing/monitoring for example can be
important, as the minimisation of corrosion can
assist in microbial control as well as enhance the
system’s life.
Where the testing of other parameters is required, it
should be undertaken by laboratories accredited by
NATA to undertake such testing.
12
6 Water Treatment
It is the responsibility of the WTSP to maintain the waters of a cooling
tower system within accepted parameters, as defined by legislation
and the client.
6.1 Water QualityMonitoring of chemical, physical and biological
water quality will provide the WTSP with feedback
on whether the water treatment system established
for the cooling tower system is effective. After
successful establishment of the treatment system,
routine monitoring and maintenance (as required by
the system’s Risk Management Plan), is then
required.
If results indicate that some of the desired
parameters are not being achieved, then
modification of the treatment system must take
place to achieve the desired parameters and
outcomes.
6.2 Microbial ControlMicrobial control is a mandatory requirement for
cooling tower systems (as defined by the
Regulations) and the treatment system deployed by
the WTSP must be designed to achieve microbial
control. The chemical and/or physical agents that
may be used for this purpose must be deployed in
accordance with the manufacturer’s specifications.
Where the use of the selected agent(s) in accordance
with the manufacturer’s specifications does not
result in acceptable microbial control, then other
causes for enhanced microbial growth must be
investigated, in conjunction with measures designed
to increase the established treatment regimes
effectiveness (increased dose or an alternative
treatment agent(s) deployed). The Health (Legionella)
Regulations 2001 require cooling tower systems to
be disinfected and cleaned when unacceptable
results are obtained.
If cooling tower systems are still problematic in
achieving acceptable microbial control after all
avenues have been explored, and the relevant
requirements of the regulations have been followed,
then the system may need to be shut down until the
cause of the problem has been rectified.
Consultation with the Department of Human
Services should occur in such circumstances.
The Department must be notified if three
consecutive positive Legionella test results are
received.
6.2.1 BiocidesIt is the responsibility of the WTSP to provide an
effective water treatment service for microbial
control, in accordance with the advice and
specifications for use of the manufacturer of the
technology and/or chemical treatment regime
adopted.
The treatment regime adopted must also account for
the possibility of eventual microbial resistance
against a specific biocide or formulation of biocides.
Alternative biocides should be used on a regular
basis to reduce the likelihood of resistance
developing.
13
The chemical treatment regime adopted must also
ensure that all chemicals used are compatible and
that the desirable pH range for their optimal
effectiveness is maintained.
The water treatment regime provided by a WTSP
must ensure so far as is practicable that an effective
concentration of biocide(s) is present in the system
under their control, at all times.
Where WTSPs blend chemicals (including biocides)
they need to be handled with appropriate care.
Chemical biocides are toxic substances that can also
exhibit other hazards and therefore need to handled
and used with caution and in accordance with
regulatory requirements, such as the Drugs Poisons
and Controlled Substances Act 1981 and the
Occupational Health and Safety (Hazardous
Substances) Regulations 1999.
6.3 Scale ControlScale formation will reduce the efficiency of heat
transfer operations and can contribute to microbial
growth.
It is the responsibility of the WTSP to ensure that
the rates of make-up water, and system bleed, and
water pH, are controlled in such a manner so as to
reduce the build-up of scale to levels that do not
adversely affect system performance.
6.4 Corrosion ControlCorrosion control has many aspects, only some of
which fall into the general responsibilities of WTSPs.
Corrosion may occur due to erosion and/or
impingement attack, loss of protective surface
coatings, or incompatible materials of construction.
Corrosion due to such causes is avoided by proper
equipment design and maintenance and cannot
always be corrected by water treatment.
The types of corrosion that are within the ambit of
the WTSP are electrochemical in nature and are able
to be corrected by conventional water treatment.
WTSPs must understand the underlying
mechanisms of corrosion within a system and
provide advice as to how it may be managed
effectively. This may mean indicating that water
treatment alone will not solve the problem and
other issues outside of the WTSP’s control are at the
cause of, or are contributing to the problem.
WTSPs must also ensure that the water treatment
regime they recommend does not cause excessive
corrosion and reduce the capital life of the system,
or unduly increase maintenance costs.
Where corrosion issues are beyond the capability of
a WTSP, appropriate specialist corrosion consultants
should be recommended. It is the responsibility of
the organisation contracting such specialised
services to ensure that provider is capable and
competent of providing such a service.
6.5 Non-Chemical OptionsThis Code of Practice supports the use of any
techniques that can provide consistent and
acceptable treatment of cooling tower waters, such
that the desired control over microorganisms, scale
formation and corrosion are achieved, and all
regulatory requirements are met.
A range of non-chemical options exist and can be
effective in enhancing or replacing traditional
chemical controls in certain applications.
14
6 Water Treatment
However, a non-chemical option may not provide a
residual biocidal effect throughout a system. In
these situations, they may be regarded as a
supplementary form of treatment, and care should
be taken in placing such an option in the most
strategic location within a cooling tower system.
Whichever non-chemical system is adopted, it
should have proven efficacy, be fit for its purpose
and must be installed and maintained in accordance
with the manufacturer’s specifications.
In the future, there may be a range of non-chemical
treatment methods developed and applied to the
treatment of cooling tower waters. When such
systems come on-line, this Code of Practice can be
amended to address any relevant aspects of
applicability, operation and maintenance.
6.6 Specific System ControlsA number of specific system controls can be
necessary to enhance the efficacy of a water
treatment program offered by a WTSP. Such system
specific controls can be incorporated into the risk
management plan for a facility where appropriate
(refer A Guide to Developing Risk Management Plans
for Cooling Tower Systems).
6.6.1 Auto-Dosing EquipmentAuto-dosing equipment has become more common
as WTSPs strive to ensure that the desired
concentrations of treatment chemicals are circulating
within a system.
Auto-dosing can be used to control pH, the
concentration of biocide(s), and corrosion inhibitors.
Such equipment is not fail-safe and must be
regularly checked and properly maintained to
ensure that the expectations of the water treatment
program are achieved.
Installing alarms will indicate that the auto-dosing
pump or feedback detector (where applicable, such
as pH probe) has failed, in systems designated to be
of potentially high risk.
The Guide to Developing Risk Management Plans
recommends standard operational programs based
on the risk classification of the system. As a
minimum, these frequencies should be
recommended to the client for adoption. With
regard to inspections of the system, the WTSP
should show the designated “responsible person(s)”
at the premises how to check auto-dosing
equipment and associated detectors (if applicable).
Such equipment should be checked during every
inspection.
Any problems with the auto-dosing equipment or
ancillary detectors should be reported by the
responsible person to the WTSP as soon as possible,
for immediate rectification.
All inspections should be recorded in an
inspection/maintenance log maintained on-site
All such equipment should be installed, maintained
and calibrated in accordance with the
manufacturer’s specifications and in accordance
with the terms of agreement between the WTSP and
the client.
6.6.2 Make-Up Water and Bleed Rate ControlsMake-up water and bleed rates for cooling tower
systems must be properly managed to maintain the
appropriate concentrations of treatment chemicals,
and total dissolved solids limits, within a system.
Where auto-dosing equipment is used, it must be
integrated into the make-up water, with bleed rate
cycles applicable to the installation.
The WTSP must ensure that the water treatment
program designed and implemented for a given
15
cooling tower system addresses the requirements
and relationships between the dosing of water
treatment chemicals, or alternative treatment
regimes, and the regulation of make-up water and
system bleed rates.
As make-up water and bleed rate requirements will
vary according to cooling system demands and
climatic conditions, the program developed by the
WTSP must account for this.
The quality of make-up water can also impact on
effective water treatment and must be considered by
WTSPs when designing and implementing a
treatment program.
6.6.3 System CleanlinessThe water treatment program cannot be considered
in isolation from the need for physical cleanliness of
the total system. Both are essential; one is not an
alternative to the other.
Regular comprehensive cleaning of the system
should be provided as a necessary adjunct to the
water treatment program and/or as defined in the
system’s Risk Management Plan.
WTSPs may choose to offer system cleaning as part
of a total service to the client and should establish
cleaning criteria with the client that triggers the
need for additional routine cleaning of the system.
Cleaning of the system is also required by regulation
under certain circumstances.
Where a WTSP subcontracts the cleaning of the
cooling tower system, they must ensure that the
cleaning of the system is done safely and in
accordance with required specifications.
6.7 Record-KeepingThe WTSP shall keep records detailing the design
basis for the water treatment program adopted for
each cooling tower system they service, including
the calculations done to determine appropriate dose
rates or treatment levels, make-up water
requirements and bleed rates. Analytical results
used in these determinations must also be
maintained.
Where a cooling tower system has its treatment
regime modified or changed as a result of
unacceptable monitoring results, the design basis for
these changes must be recorded and attached to the
file for that system.
All results of microbial analysis associated with a
cooling tower system must also be maintained on
the system’s file on-site.
Over time, a useful record of ineffective and
effective water quality maintenance programs, and
remedial actions for problematic systems, will be
established and available for reference when
designing treatment regimes for similar systems.
All maintenance and servicing undertaken by a
WTSP must be entered into the maintenance log
kept at the cooling tower system site. Note that this
is a requirement of Regulation 23 of the Health
(Legionella) Regulations 2001.
All such records must be maintained on site and at
the premises of the WTSP for a minimum of three
years. Such records will be the subject of inspection
by Department of Human Services inspectors and
also be audited annually as part of the system’s Risk
Management Plan.
16
7 Management Systems
Management systems help manage potential risks to a business.
The most important are:
• Quality control and quality assurance
• Occupational health and safety
• Environmental management
• Risk management.
It should be noted that it is both possible and
desirable to have all the above integrated into one
management system.
This Code of Practice does not propose that these
systems be solely developed for the purposes of
independent certification, but that the basic
elements required by these recognised standards be
adopted, modified accordingly and implemented by
each business, where applicable.
This is in recognition of the difficulty smaller firms
can have in obtaining such certification and the time
and ongoing costs of certification.
The objective is to be able to demonstrate that
appropriate management systems are in place, are
utilised as a normal component of doing business,
can be scrutinised to determine what went wrong,
and can be audited either internally, or by a third
party, if necessary to demonstrate that correct
procedures and best industry practice was achieved.
This can be particularly important where
prospective litigation may result from allegations
made with respect to the water treatment of a
cooling tower system.
Management systems can therefore both help
sustain and protect your business.
Note that some WTSPs associated with chemical
companies may be able to join the Responsible
Care® program administered by PACIA (Plastics
and Chemicals Industry Association) which
provides elements of the above management
systems when implemented.
7.1 Quality Control and QualityAssurance
WTSPs should establish the basis of a quality
management system within their business
management structure, to account for and verify the
basis upon which service delivery occurs.
Records should be kept in sufficient detail as to
demonstrate due diligence to an auditor and/or the
regulator, if required.
The adoption, development and implementation of
an appropriate Quality Management System (QMS)
modelled to the ISO 9000 series of requirements can
provide the WTSP with a management framework
which, if effectively applied, monitored and
recorded, can demonstrate to the client, the
17
regulator, or other stakeholders, compliance against
stated requirements (including requirements for
duty of care).
7.2 Occupational Health andSafety
Occupational health and safety management
systems should also be incorporated into an
organisation’s quality assurance system, to verify
the actions that must take place with respect to the
management of health and safety of employees.
This Code of Practice does not require organisations
to establish occupational health and safety
management systems that are certified under
AS/NZS 4801, however, the basic elements of the
standard must be incorporated in the systems
developed.
7.3 Environmental Management Environmental management systems should also be
incorporated into an organisation’s quality
assurance system, to verify the actions that must
take place with respect to the management of wastes
and the authorised discharge of cooling tower
waters to sewer.
This Code of Practice does not require organisations
to establish environmental management systems
that are certified under ISO 14000 series, however,
the basic elements of the standards should be
incorporated in the systems developed.
7.4 Risk ManagementThe basis of all of the above management systems
(quality, occupational health and safety, and
environmental) is to manage risk—risks to the
business, its staff, clients, the general public, and the
environment.
Further guidance on risk management can be found
in AS/NZS 4360:1999.
To manage risks in the most cohesive and integrated
way, all reasonably foreseeable aspects of service
design and delivery, accountability, occupational
health and safety, environmental management and
risk management need to be incorporated into the
organisation’s quality management system.
18
8 Occupational Healthand Safety
The legal obligations of occupational health and safety are clear—it is
the employer’s responsibility to provide employees with a healthy and
safe work environment. Similarly it is the contractor’s responsibility to
provide sub-contractors with a healthy and safe work environment.
The servicing of cooling towers by WTSPs can
potentially expose service technicians to a number
of potential hazards, for which procedures and
practices to manage such risks must be in place
within occupational health and safety management
plans and/or systems.
All cooling tower systems that are to be serviced by
a WTSP should have had an inspection conducted
prior to bidding for and/or undertaking such work,
to investigate and anticipate any occupational health
and safety issues that may be associated with
servicing the system(s) in question.
Those occupational health and safety issues that are
the responsibility of the WTSP can be then
appropriately addressed in the health and safety
plan (HASP) developed for the servicing of a
particular client’s system(s). The health and safety
plan will address generic occupational health and
safety issues applicable to all servicing operations
(potential exposure to Legionella), as well as those
issues specifically relating to the facility in question
(access/egress, electromagnetic radiation exposure).
Where a cooling tower system presents
unacceptable occupational health and safety risks
beyond the control of the WTSP, such as
access/egress issues, the client should be informed
that servicing will be based on acceptable standards
being met. Such safety requirements should be
incorporated into the contract between the WTSP
and the client.
Further guidance on potential health and safety
issues is available from WorkSafe Victoria (formerly
the Victorian WorkCover Authority).
8.1 Potential Exposure toLegionella Bacteria
WTSPs servicing cooling tower systems do not
know at the time of servicing whether Legionella
bacteria are present or not within the cooling
tower’s water, or whether sufficient Legionella
bacteria are contained within aerosols being
generated by the cooling tower system to potentially
cause infection, or whether they are being exposed
to sufficient aerosol to potentially cause infection.
In reality, such information is not possible to obtain
in real time.
It is essential therefore that water treatment
technicians err on the side of safety and deploy
appropriate respiratory protection when working in
close proximity to cooling tower systems.
As a minimum, a half-facepiece disposable
particulate filter of class P2 shall be used for
protection against cooling tower aerosols.
However, the preferred use of reusable rubber half
facepiece respirators with a Class P2 rating should
19
be considered, as these provide a better fit and can
incorporate other protective attributes into the filter
canister, such as protection against organic vapours,
and acid gases.
The choice of respiratory protection by the WTSP
will ultimately depend on the environment to be
worked in and an assessment of the potential
respiratory hazards that may be present.
8.2 Chemical Issues8.2.1 Personnel Protective EquipmentWhere chemicals are used in the treatment of
cooling tower systems, the Material Data Safety
Sheets (MSDS) provided shall be studied by the
WTSP to determine what personnel protective
equipment and other precautions are required to
protect technicians from inadvertent exposure.
Technicians shall be accordingly instructed and
provided with appropriate protective equipment
and training.
8.2.2 Dangerous Goods and HazardousSubstances Requirements
WTSPs may handle a variety of dangerous goods
and hazardous substances.
The requirements of the Occupational Health and
Safety (Hazardous Substances) Regulations 1999
apply to these substances and place requirements on
the employer who allows staff to use hazardous
substances.
Where dangerous goods are stored at the WTSPs
premises in excess of prescribed quantities, the
Dangerous Goods (Storage and Handling)
Regulations 2000 also apply.
All chemical containers must be labelled in
accordance with the relevant dangerous goods or
hazardous substances requirements, where
applicable.
The WTSP must keep and maintain a register of
dangerous goods and hazardous substances used by
the organisation, together with an up-to-date MSDS
for all such materials. The register and all MSDS
must be available to employees, and employers
must provide employees with information,
instruction and training on hazardous substances
and dangerous goods, to enable employees to
perform their work in a manner that is safe and
without risks to health.
The employer must conduct a risk assessment
on all hazardous substances used in the workplace
before the substance is used for the first time.
If the substance is already in use, then this risk
assessment should have been completed prior to the
2 September 2000.
Employers must endeavour to minimise the risks
associated with any dangerous goods or hazardous
substances used in the workplace.
8.2.3 CompatibilityWhere multiple chemicals are used, the chemical
compatibility between them and the effect pH can
have on this compatibility must be understood.
When developing a health and safety plan for a
given client, the chemicals to be used must be
critically examined to determine if any potential for
incompatibility exists, and any such potential
incompatibilities documented in the HASP.
20
8 Occupational Health and Safety
8.3 Industrial SitesCooling tower systems located at industrial
premises may present potential exposures to
chemical substances relating to the industrial
processes on the site. The location of the cooling
tower system may be elevated and near process
discharges that could adversely impact on the health
of water treatment technicians.
The health and safety induction program required
by many industrial sites will typically deal with
emergency procedures and basic personnel
protective equipment requirements, but may not
include the potential for chemical exposures on roof
tops by technicians servicing cooling towers. The
WTSP should enquire as to the nature of any nearby
process emissions or other hazards in proximity to
the facility they are servicing and take advice from
the site operator as to what precautions or
protection may be required.
The occupier or person who has management
control of the site has responsibilities with respect to
persons they employ to undertake works at their
premises;this includes WTSPs.
A work permit may be required before any
maintenance or servicing works can take place on a
cooling tower system(s). Consideration of the risks
associated with any elevated hazards should be
incorporated into the permit conditions.
Where a work permit is not required, WTSPs must
check in with the appropriate site representative
prior to servicing the facility.
8.4 Electromagnetic RadiationWhile servicing cooling towers, service technicians
may be in close proximity to communication
transceivers emitting non-ionising electromagnetic
radiation.
Although the risks associated with mobile phone
transceivers is considered small by the relevant
authorities, there are other communications devices
found on roof tops and other elevated locations
which may present a more significant risk to
persons working in their vicinity. This includes
microwave dishes and HF (high frequency), VHF
(very high frequency) and UHF (ultra-high
frequency) emitters.
The designated safe distances applicable to such
devices depend on the maximum power the device
is capable of emitting and the time that will be spent
at that distance. Longer exposure times are
acceptable at greater distances and shorter exposure
times at closer distances.
Equipment which potentially present such risks to
proximate persons should be appropriately labelled
and warnings should be located on access doors to
the rooftop or service area.
WTSPs must enquire of building owners or the
delegated responsible person as to whether such
potential hazards exist in the vicinity of the cooling
tower system(s) to be serviced as part of the HASP
to be developed for that site.
Advice on exposure standards and the types of
equipment, which may put WTSPs at risk, can be
obtained from the Australian Communications
Authority.
8.5 Access/Egress and Working at Heights
The WTSP industry needs to take a more proactive
stand on the occupational health and safety issues
relating to access/egress to cooling tower systems
that are to be serviced, and any applicable working at
height requirements, and inform and educate clients
as to their responsibilities in providing suitable
access and egress from cooling tower systems in
accordance with the relevant requirements.
21
The site occupier has a responsibility to provide safe
access/egress to WTSPs employed to service
systems on their premises.
Safe access/egress to cooling tower systems must be
a standard clause in contracts between WTSPs and
their clients, and WTSPs should collectively refuse
to service facilities which have unsafe access/egress.
8.6 Confined SpacesEntry to and working in confined spaces is
regulated by the Victorian Workcover Authority
(VWA) via their Occupational Health and Safety
(Confined Spaces) Regulations 1996. Guidance on
how to meet the requirements of the regulations is
found in VWA’s Code of Practice for Confined Spaces
(No.20, March 19973).
In addition, there is an Australian Standard/
Worksafe Australia National Standard AS 2865:1995
“Safe working in a confined space” that can provide
further guidance on this issue.
The entry into cooling towers for the purposes of
cleaning constitutes an entry into a confined space
and all relevant regulatory provisions apply.
Any hazards associated with fans, pumps, and so
on, must be managed, by ensuring that such
equipment is isolated so that it may not be
activated whilst someone is working within the
confined space. A tagging system for such
equipment should be used in conjunction with a
confined space entry and works permit.
The use of chemicals in the cleaning of cooling
towers could give rise to unacceptable levels of
contaminants within a cooling tower during the
cleaning process and this potential hazard must also
be addressed in the risk assessment and Health and
Safety Plan (HASP) for this activity.
At industrial sites, confined space entry will be
governed by the site operator’s occupational health
and safety requirements and a permit should be
required for entry for the purposes of cleaning or
other maintenance activities.
WTSPs should not enter a confined space unless
they:
• Have had appropriate training.
• Are knowledgeable of the potential hazards
associated with the confined space and the
activities that they intend to undertake therein.
• Have undertaken all appropriate measures to
eliminate or minimise the risks associated those
hazards.
• Have evidence that the atmosphere is safe within
the confined space.
• Are permitted to enter the confined space and
undertake the intended activities.
• Have measures in place to ensure rescue is
possible in the event of an incident.
8.7 Climatic ConsiderationsClimatic conditions can potentially impact on the
health and safety of water treatment technicians.
Examples include:
• Heat Stress.
• Sunburn.
• Hypothermia.
• Slips and falls caused by strong winds and/or
heavy rain (causing slippery surfaces).
• Electrical hazards due to outdoor surfaces and
electrical equipment being wet after rain, or
during electrical storms.
Occupational health and safety plans must address
such issues and provide guidance on the procedures
to be adopted to minimise such risks.
3 The provisions of the VWA’s Code are not mandatory. That is, a personmay choose to comply with the Regulations in some other way, as long asthat method also fulfils the requirements of the Regulations. However, inlegal proceedings, failure to follow an approved code of practice can beused as evidence that a person or company has not complied with theprovisions of the Occupational Health and Safety Act or Regulations.
22
8 Occupational Health and Safety
Common sense must be used when climatic
conditions are so extreme that they may impact on
the safety of an individual servicing a cooling tower
system.
8.8 Electrical SafetyElectrical equipment and power supply should be
isolated and tagged prior to entry into a cooling
tower’s confined space.
Every electrical supply to which portable equipment
or tools could be connected, or which supplies
power to such through flexible cords, should
incorporate residual current devices (RCDs) to
protect against electric shock.
RCDs and electrical equipment and power supplies
associated with cooling towers shall be installed in
accordance with AS/NZS 3000: Wiring Rules.
Where electrical equipment and power supply via
flexible cord is situated outside and exposed to the
elements, all necessary measures must be
undertaken to ensure that this equipment is safe to
check, calibrate, use or service under all expected
and prevailing climatic conditions.
The degree of protection for such equipment shall
be in accordance with AS1939: Degree of protection
provided by enclosures for electrical equipment.
The requirements for testing and tagging of
electrical equipment and leads are set out in
AS/NZS 3760: In-service safety inspection and
testing of electrical equipment.
If not, then warnings must be issued in the HASP
for that client, and the relevant employees informed
of such potential hazards.
Note that within industry, special safety
requirements exist for designated hazardous areas
which may contain flammable liquids, gases or
dusts. These provisions apply to the use of
intrinsically safe electrical equipment and the
maintenance and servicing of such equipment.
Where WTSPs are servicing or installing equipment
at industrial sites, it is essential that enquiries are
made as to whether the area where the cooling
tower system is located is a designated hazardous
area. If it is a designated hazardous area, then the
relevant safety requirements must be followed.
Electrical equipment and power supply associated
with the cooling tower must be installed and
maintained in accordance with the required
standards.
8.9 Manual HandlingManual handling is regulated by WorkSafe Victoria
via the Occupational Health and Safety (Manual
Handling) Regulations 1999. Guidance on how to
meet the requirements of the regulations is found in
VWA’s Code of Practice for Manual Handling (No.25,
April 20004).
A quarter of all workplace injuries involve manual
handling. An employer must undertake a risk
assessment of manual handling activities and endeavour
to reduce any identified risks so far as is practicable.
The cartage of containers of chemicals and
equipment to the cooling tower system (which may
include scaling ladders or flights of stairs) may
constitute a potential manual handling hazard
which may require risk reduction.
WTSPs must identify any potential manual handling
issues associated with servicing cooling tower
systems and put the necessary plans in place to
reduce such risks to staff.
4 The provisions of the VWA’s Code are not mandatory. That is, a person maychoose to comply with the Regulations in some other way, as long as thatmethod also fulfils the requirements of the Regulations. However, in legalproceedings, failure to follow an approved code of practice can be used asevidence that a person or company has not complied with the provisions ofthe Occupational Health and Safety Act or Regulations.
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9 EnvironmentalManagement
The traditional approach to treating cooling tower waters involves the
use of a variety of chemical products that can adversely impact on the
environment if not managed sensibly and in accordance with the
relevant legislation. All chemicals used in the treatment of cooling
tower systems must be managed in accordance with relevant
environmental, occupational health and safety, dangerous goods and
hazardous substances legislation.
Chemical issues must be covered in: the quality
management system in terms of purchasing policy
and the defined quality of product; the occupational
health and safety management system in terms of
potential occupational health and safety issues
relating to use and the supply, understanding and
application of MSDS; and the environmental
management system in terms of management and
disposal of chemicals, their containers and spills,
and the discharge of cooling tower waters.
9.1 Waste ManagementProper management of chemicals by WTSPs should
not result in any wastes being generated, apart from
chemical containers and their residues which are
classified as prescribed wastes by EPA Victoria.
It should be noted that it is illegal to dispose of
containers with residues of biocides or other
hazardous substances into the general waste stream.
Chemical containers should be triple rinsed with
fresh water (using 10 per cent of the container’s
volume each time) and the rinsate discharged into
the cooling tower basin, before the cleaned container
is punctured and legally placed into the general
waste stream. The product labels should also be
removed or defaced to indicate that it no longer
contains chemical product.
If containers are not to be cleaned, they must be
managed in accordance with EPA requirements for
prescribed wastes.
If possible, chemical containers should be returned
to the chemical supplier for refilling, as this is a
better environmental option.
9.1.1 Spills and LeaksSpills and leaks of treatment chemicals should be
collected and either reused, or disposed of to the
sewer with sufficient dilution water to mitigate
against any potentially adverse impacts, after
permission has been obtained from the local sewage
authority. If this is not possible, desirable, or
allowed, then the collected material must be
managed as a prescribed waste in accordance with
EPA requirements.
Spill kits should be part of the WTSP’s ‘tool kit’ to
enable the proper management and cleanup of
spills and leaks.
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9 EnvironmentalManagement
WTSPs should endeavour to place chemical
containers that are part of a chemical delivery
system, undercover wherever possible, and within a
bunded area or tray capable of containing the total
volume of a single container and 10 per cent of any
other containers within the bunded area. Such
practices will enable any spills or leaks from such
containers to be more efficiently and effectively
managed.
Leaks from cooling tower systems into the
immediate area around or below the system due to
excess water in the system, or from structural
defects, will usually result in an inadvertent
discharge to stormwater or land and must be
rectified as soon as possible. WTSPs must contact
the responsible person to rectify such system
leakages, if they are beyond their control.
9.2 Authorised Discharge toSewer
All discharges of cooling tower waters should be
to sewer and be authorised by the relevant sewage
authority in accordance with the Water Industry
Regulations 1995 or the Water Act 1989. WTSPs
must advise their clients accordingly.
Where access to a sewerage system is available, all
cooling tower systems must be registered with the
relevant sewage authority and permission sought
to discharge to sewer before commissioning. All
such discharges of cooling tower waters must be to
an approved and authorised sewer connection.
This is the responsibility of the building facility
owner (or their delegated representative), not the
WTSP.
Cooling tower systems are to be connected to the
water supply system and property service drains in
accordance with AS/NZS 3500 Part 1 and Part 2
(National Plumbing and Drainage Code).
EPA Victoria has indicated that it is illegal to
discharge any chemical residues or cooling tower
waters to land or storm water drains. It has also
indicated that in the event of a cooling tower system
causing pollution, it would consider enforcement
action against both the owner and contracted parties
involved in the discharge.
Therefore, the WTSP must obtain assurances from
the client that the cooling tower system(s) to be
serviced is compliant with the requirements of the
local water/sewage authority. A copy of the trade
waste agreement should be obtained, so as to ensure
that the water treatment service is conducted in
compliance with any relevant provisions of the
trade waste agreement.
It should be noted that acceptance of trade waste to
sewer is at the discretion of the relevant water/
sewage authority.
9.2.1 Notification RequirementsSome sewage authorities have a requirement that
they must be notified when the cooling tower
system is to dump its water to sewer, in the event of
the need to disinfect, clean and disinfect (as required
by regulation) as a result of a positive Legionella
result. It is the WTSPs responsibility to be aware of
such requirements if they exist and to abide by those
requirements.
Trade waste consents are in the process of being
updated by some water/sewage authorities to
include these requirements and will provide a
contact number for notification purposes.
Each of these issues must be incorporated into the
WTSP’s management system to verify the actions
expected to be taken in each instance.
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10 Training
This Code of Practice supports the development of an industry
accredited training program for Water Treatment Service Providers
servicing cooling tower systems (as defined in the Regulations).
The approach supported by the Department of
Human Services and the representative industry
special interest group in association with AIRAH is
for a recognised qualification system to be
developed for water treatment technicians in
Victoria.
A technician classification system will be based on
relevant courses of study and levels of experience
and define a career path for water treatment service
technicians.
The details of the training system will be developed
by AIRAH in conjunction with the WTSP Special
Industry Group (SIG), interested stakeholders, and
the Department of Human Services within twelve
months of the endorsement and release of the Code
of Practice by the aforementioned parties. These
training requirements will subsequently be
described in detail in the Code.
Transitional provisions for existing experienced
practitioners need also to be developed to allow
equivalent qualifications to be awarded to these
persons subject to meeting some basic criteria and
demonstrating existing competencies. These
transitional provisions must be able to account for
the individual’s acquired knowledge, experience,
and client base. The basic technical competencies of
the individual must be demonstrated to the
accrediting body.
Employees who have completed their company’s
own internal training requirements can obtain the
relevant qualifications provided the level of training
is equivalent and necessary competencies can be
demonstrated.
The training level status will apply to the
individual, not the organisation.
It is important for all individuals involved in WTSP
to keep accurate records of their training,
experience, qualifications, and any accreditations.
Companies should also keep duplicate records of
the above.
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11 Accreditation
This Code of Practice encourages the accreditation of WTSP
businesses and companies with AIRAH by agreeing to abide by the
requirements of the Code of Practice for Water Treatment Service
(Cooling Tower Systems).
Organisational membership is subject to written
notification that the subject organisation will comply
with the provisions of the Code of Practice, can
verify compliance with existing statutory
requirements, and is prepared to be independently
audited for its compliance with the provisions of the
Code, if required.
Where minor non-conformities are revealed during
such audits, the subject organisation will have
between one and three months (depending on the
nature of the issue) to rectify the situation to the
satisfaction of the accredited body (or its delegated
representative).
The rules of accreditation will be developed by
AIRAH in conjunction with the WTSP SIG, and
the Department of Human Services and be
incorporated into an amended Code of Practice
within six months of the Code being endorsed by
AIRAH and the Department.
The rules of accreditation will also cover issues such
as non-conformities that could or will result in
suspension or cessation of accreditation as a WTSP
with AIRAH. For example, refusing to be audited if
requested to do so should result in a loss of
accreditation. However, the rules relating to
accreditation are yet to be developed. It is very
important that the accreditation process have some
disciplinary provisions inherent if it is to be seen as
an enforceable and credible self-regulating
benchmark for the industry. Appeal provisions need
also to be considered with respect to suspensions or
cessation of accreditation.
Accreditation will be used to collectively negotiate
suitable insurance requirements for member
organisations and individual contractors.
Accreditation will indicate that a WTSP organisation
intends to comply with accepted industry ‘best
practice’.
Accreditation may be used to promote and market a
WTSP business.
Alternatively, WTSPs may indicate in writing to
clients that they comply with the provisions of the
Code of Practice and are prepared to be
independently audited for their compliance if
necessary. However, the Department of Human
Services would prefer that an enforceable
accreditation mechanism was in operation.
With respect to accreditation, a period of six months
grace will be allowed for companies to upgrade
their operations to comply with the Code after they
have signified their intention to comply with the
Code and seek accreditation.
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12 Insurance Requirements
WTSPs must be able to demonstrate that they have the following
insurance coverage as a minimum (unless the WTSP is able to
demonstrate that it is self-insured to an equivalent or greater level):
• Public Liability Insurance (PLI): $10,000,000
• Professional Indemnity Insurance (PID): $2,000,000.
Higher levels of insurance may be required to meet
client expectations in some instances.
Qualified technicians employed on a permanent full
time or part time basis will have their PID covered
by their employer.
Qualified sub-contractors must provide their own
PID insurance for work sub-contracted to them.
Insurance will be collectively negotiated by AIRAH
on behalf of the member WTSPs who are not self-
insured and require insurance, and a preferred
insurance provider recommended to accredited
industry members.
A preferred insurance provider will be appointed as
soon as possible after the release of the Code of
Practice.
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13 Contracts
This Code of Practice defines the required standards for WTSPs and
may be used as defining ‘best practice’ for the purposes of contractual
arrangements.
Standard clauses for contracts referring to the
various relevant provisions of the Code are to be
developed by AIRAH in consultation with its
members for use in contracts between accredited
WTSPs and clients.
For example, safe access/egress to cooling tower
systems must be a standard clause in contracts
between WTSPs and their clients.
Any delegation or acceptance of responsibilities
must be contractually based, or in written
agreements between parties, where this is possible.
The roles and responsibilities defined in this Code
may be used as a basis for this clarification of roles
and responsibilities.
Contingency planning is based around attempting
to plan for the appropriate management of events
that may or may not occur, or may scarcely be
foreseeable. It is important therefore that a
contingency clause be in the contract between the
WTSP and the client to allow for cost recovery for
services that must be provided in the instance of an
adverse event, for example.
WTSPs should be required by facility owners (or
their delegated responsible representative) to sign
a statement that indicates their compliance with
the Code of Practice and that they have the
appropriate management systems in place that can
verify this compliance.
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Glossary
AIRAH Australian Institute of Refrigeration, Air-
conditioning and Heating.
Automated dosing device A device or delivery
system that automatically discharges the required
amount of biocide to the water inside a cooling
tower system, so as to maintain the required
concentration of biocides in the cooling tower
system.
BC Building Commission.
Biocide A chemical or physical agent that can
cause the death of microorganisms dependent of the
dose administered. With respect to this Code, it is
also an agent capable of killing Legionella bacteria.
Biodispersant A chemical compound added to the
water inside a cooling tower system, to penetrate
and break down any biofilm that may be present on
the wetted surfaces of the cooling tower system.
Biofilm A surface layer of microorganisms. It is
usually combined with particulate matter, scale and
products of corrosion.
CFU/mL Colony Forming Units per millilitre of
sample. Refers to bacterial levels detected in a
sample.
Clean To render free from visible sludge, foam,
slime (including algae and fungi), rust, scale, dirt,
and any deposit of impurities or other foreign
material.
Cleaning Maintenance work including
disinfection, draining, dispersion and removal of
solids, manual scrubbing and flushing.
Cooling tower A device for lowering:
(a) the temperature of recirculated water by
bringing the water into contact with fan forced
or fan induced air; or
(b) the temperature of water, a refrigerant or other
fluid in a pipe or other container, by bringing
recirculated water and fan forced or fan induced
atmospheric air into contact with the pipe or
container.
An evaporative air cooler or evaporative air
conditioner is not a cooling tower.
Cooling tower fill The structure located within a
cooling tower designed to create an extensive
wetted surface area using the recirculated water
through which air passes.
Cooling tower system Defined as:
(a) a cooling tower or number of interconnected
cooling towers that use the same recirculating
water; and
(b) any machinery that is used to operate the tower
or towers; and
(c) any associated tanks, pipes, valves, pumps or
controls.
Decontamination A process used when a cooling
tower system is suspected or implicated as a source
of infection of Legionnaires’ disease. The
decontamination process is usually determined in
consultation with the Department of Human
Services. It involves a series of actions to disinfect,
clean and re-disinfect the cooling tower system. The
process is described in detail in the Guide to
Developing Risk Management Plans for Cooling Tower
Systems.
30
Disinfect To carry out a process:
(a) intended to kill or remove pathogenic micro-
organisms, including Legionella; and
(b) in the case of a cooling tower system, consists of
dosing the water of a system with either:
(i) a chlorine-based compound, equivalent to at
least 10 mg/L of free chlorine for at least one
hour, while maintaining the pH of the water
between 7.0 and 7.6; and
(ii) a bromine-based compound, equivalent to at
least 20 mg/L of free bromine for at least one
hour, while maintaining the pH of the water
between 7.0 and 8.5.
EPA Environment Protection Authority (Victoria)
Heterotrophic Colony Count (HCC) An estimate
of the number of viable units of bacteria per
millilitre of water made using the pour plate, spread
plate or membrane filter test. Also known as total
bacteria count, total plate count or viable bacteria
count test.
Manual Handling Any activity requiring the use
of force exerted by a person to lift, push, pull, carry
or otherwise move, hold or restrain any object.
Operational program A documented program
detailing the water treatment and physical
maintenance of the cooling tower system, including
details of service frequency.
Owner of any land The owner in relation to the
land or Crown land within the meaning of the
Building Act 1993.
PIC Plumbing Industry Commission.
Responsible person The person who owns,
manages or controls the cooling tower system.
Risk Management Plans (RMPs) The process
prescribed by the Department of Human Services
for the assessment and management of risk factors
associated with a given cooling tower system, the
classification of the cooling tower system and the
prescription of a maintenance and servicing regime
appropriate for the determined risk category.
Guidance on the development of RMPs can be
found in the Department’s publication: A Guide to
Developing Risk Management Plans for Cooling Tower
Systems.
Service frequency The frequency with which the
cooling tower system is thoroughly checked by a
competent person. Includes a check of the water
quality and/or physical components.
Slug dosing The process of adding in a single dose
a much higher amount of chemical biocide than is
normally applied, with the intention of rapidly
raising the concentration of biocide in the water to a
level expected to kill most if not all organisms in the
water.
VWA Victorian WorkCover Authority
WTSP A person or organisation which provides a
service to maintain the waters of a cooling tower
system, so as to minimise microbial growth, and/or
scale formation, and/or corrosion within a cooling
tower system, by the use of chemical and/or
physical agents. The physical cleaning of an empty
cooling tower system may be a service offered by
WTSP, but is not covered by the Code at this point
in time. Similarly equipment and chemical
suppliers, and consultants who prepare Risk
Management Plans, are also outside the scope of the
Code at this time. In subsequent reviews, the
industry may revisit the relevance and/or
practicality of including such activities within the
Code of Practice.
Glossary